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X in (-oo:+oo)
(X-3)/6 = 18 // - 18
(X-3)/6-18 = 0
(X-3)/6+(-18*6)/6 = 0
X-18*6-3 = 0
X-111 = 0
(X-111)/6 = 0
(X-111)/6 = 0 // * 6
X-111 = 0
X-111 = 0 // + 111
X = 111
X = 111
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